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Re: [Xen-devel] [PATCH v2 07/10] vm_event: Add vm_event_ng interface
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
- From: Jan Beulich <JBeulich@xxxxxxxx>
- Date: Fri, 19 Jul 2019 08:22:28 +0000
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- Cc: 'Petre Ovidiu PIRCALABU' <ppircalabu@xxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, KonradRzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, "Tim \(Xen.org\)" <tim@xxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>, JulienGrall <julien.grall@xxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 19 Jul 2019 08:24:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2 07/10] vm_event: Add vm_event_ng interface
On 19.07.2019 09:56, Paul Durrant wrote:
>> From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>
>> Sent: 18 July 2019 14:59
>>
>> So, at this point the most promising solution is allocating the memory
>> in XEN, sharing it with ID using share_xen_page_with_guest, and mapping
>> it with xenforeignmemory_map_resource (with the flag
>> XENMEM_rsrc_acq_caller_owned set)
>
> If that page is shared with the ID then XENMEM_rsrc_acq_caller_owned
> should *not* be set. Also, that flag is an 'out' flag... the caller
> doesn't decide who owns the resource.
I had implied that it's really MD that's meant here, but maybe I was
wrong doing so.
> TBH I regret ever introducing the flag; it caused a lot of problems,
> which is why it is no longer used.
It's a tools only interface - why don't we drop the flag if you now
think it was a bad idea to introduce it?
Jan
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